5tgb column on keyboard not working on Macbook Pro

I just had my logic board replaced.
First thing I did was to reinstall Mountain Lion on the computer which had an erased HDD and SSD combination.
While setting up the computer, I realized '5 t g b' column on the mounted keyboard is not responding (including the keyboard light dimming button - F5)
The discussions on the forums show similar cases but without solutions.
I tried these:
- PRAM reset
- SMC reset
- Erased the drive and installed Snow Leopard.
The buttons started functioning on their own after some hours. So I re-installed the Mountain Lion again, to see the same problem come up and then disappear after a few mins working in the voice over application to continue my setup.
The fact that the problem was on both versions of the OS seems to suggest it's a hardware failure. I looked at the back of the computer to see if something was loose, but all connections seemed fine.
Any ideas on what to do? or ideas on what may cause the problem?
(will visit the AASP in three days, but they asked me to not install anything else on the computer so they can check, which is delay on my work)

No the original warranty does not get voided if you replace either the RAM or the hard drive or both as long as you are not Removing the Optical drive and putting a second HDD in there.
Both of those parts. RAM and standard bay HDD, are User Upgradable and there is instruction to do so in the Manual.
What you have done with removing the Optical drive and putting a HDD or SSD in that bay is Modified the system with Parts that the User is not supposed to be replacing which VOIDS ALL WARRANTIES. Now as far as the AASP you had do the work on the logic board replacement it is up to them whether your 90 day warranty is voided or not and if the keyboard problem is part of that warranty.
Good Luck and Best Wishes.

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